Electric baker&#39;s oven.



Paente Nov. Tf, 1916.

E. H. BUCKLE.

ELECTRIC BAKERS OVEN. APPLICATION man F5317, 1914.

STAT l); FFXC.

EDWARD H. BUCKLE, OF CHICAGO, 'ILLINO ASSIGNOR TO HUGHES ELECTRIC 'HEAT-ING CQMEANE, GF CHICAGO, ILLXNOIS, A CGRPGRATION OF ILLINOIS.

ELECTRIC BKEES OVEN.

Specification of Letters Patent.

atented Nov. 7, i916.

To all whom it 'may concern Be it known that lnwano H. RUCKLE, a citizenof the United States, and a resident of Chicago, in the county of Cookand State of illinois, have invented certain new and useful Improvementsin Electric Bakers Ovens, of which the following is a specification.

My invention relates to electric ovens, and particularly to multiplecompartment bakers ovens.

it is well known that to insure excellence in cooking and baking uniformdistribution of heat is an absolute requisite. Owing to the lack of sucheven distribution of heat to all parts oi the oven, electric ovens asheretofore constructed have not been entirely successful, the usualpractice having been to concentrate heating units at the bottom of theoven and employing various methods for forcing the circulation of heatto the various parts of the oven. 'W ith such arrangement thecirculation and uniformity of heat is variable and uncertain and thebest results can not be obtained.

The important object of my invention is to provide improved arrangementwhich will insure uniform heat distribution and application and moreeflicient results. instead of placing the heating source at the bottoniof an ovenstructure and depending on the variable and uncertaincirculation of heat, i provide local heating means in each ot' the ovencompartments by generating beneath each shelf or rack the correctproportionate amount of heat for a constant even baking through allparts of the articles to be baked. rlShe heating unit directly beloweach grid or shelf will throw heat upwardly into the compartment abo-vethe. grid and will throw heat downwardly into the compartment below thegrid, each compartment thus receiving heat from both below and above,and such heat is constant and uniform and entirely surrounds thearticles to be cooked.

@n the accompanying drawing my improved arrangement is clearlyillustrated. 7figure l being a sectional view on plane l--l, Fig. 2,Fig. 2 being a sectional view on plane 2--2, l, and being` a plane viewof one ot the electric heating grids.

rhe oven structure shown is rectangular and is preferably built up ol*linner and. outer sheet metal walls 5 and 6 between which heat insulatingmaterial 7 is filled in, all in the well known manner. Extending acrossthe front of the structure are the sills 8 for the entrance ways 9 tothe oven compartments l0, each entrance way being adapted to be closedby a door ll. Secured to the side walls of the oven structure and inline with the sills l have shown channel bars l2 whose upper flanges l2aserve to support grids or racks 13 and whose lower flanges 12b serve tosupport electrical heating elements ll. The supporting grid may be ofany construction. in the construction shown grid bars a connect togetherthe end bars b of channel cross section, the flanges of the bars beingcut away inwardly from the ends as indicated at c to clear thesupporting flanges 12a of the channels l2.

rl`he construction of the heating units is best shown in Fig. 3.insulating rods l5 which may be asbestos tubes extend parallelly betweenend supporting angle bars 1G, and on the rods l5 heating conductors li'are wound. These heating units are supported by engagement of the endbars 1G with the lower flanges 12b ot the supporting channels l2. Eachheating element is thus directly below the supporting grid of the ovencompartment above and is at the top of the oven below so that eachelement throws heat upwardly into one compartment and downwardly intothe other, and the elements being electrically designed to throw oli apredetermined amount of heat, the heat throughout the oven is uniformand constant. Each article to be cooked is directly heated by theelement directly below the supporting grid and is also heated Jfrom thetop by the element below the grid above. No uncertain andvariablecirculation need there l'ore be depended upon for distributingheat to the various parts of the oven. in i'act with my arrangement nocirculation of any kind is at all necessary and the oven can be entirelysealed so tar as uniformity et heat distribution is concerned.Ureterably, however` a small vent i8 is provided to relieve againstexpansion and contraction within the oven and to allow escape or vaporswhen desired.

rhe individual heating units or elements can be connected together inany manner and wit i a main circuit and the currem' controlled to effectlow, intermediate, or high heat production as is well understood.

I claim the following: In an electric bake oven, the combination of aninsulated oven structure, an electrical heating element at the top ofsaid structure, an electrical heating element at the bottom of saidstructure, intermediate heating elements between said upper and lowerheating elements, said heating elements extending horizontally the fulldistance between the front and rear walls of said oven structure andsaid oven structure being closed whereby heat circulation is preventedin said structure and heat applied by radiation 15 against the top andbottom of articles placed on said heating elements to be baked, thearrangement as described causing the heat to be uniform throughout thestructure and enabling the full capacity of the structure. 20 to be usedfor baking.

In witness whereof, I hereunto subscribe my name this 25th day ofFebruary, A. D.

EDWARD H. BUCKLE. Vitnesses:

CHARLES J SCHMIDT, EDMUND Gr. INGERSOLL.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D C.

